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It sounds like the button is probably stuck down or the contacts are too close. Try tapping the brightness button a few times, maybe with some force, and see if the contacts will snap back in place. This could also be caused if the monitor was in a severely moisture-rich environment.

dustcore025, Need a little more info here. Do you know age of monitor? Was it or did it display a "perfect' image on it the day before? Is it under warranty? How far are you willing to go to try and repair this thing? Do you know how to "part" the snap together plastic back cover from the bezel, after removing the pedestal? This sounds to me like a Switch-mode-power-supply or Inverter problem that occurs when some Electrolytic Filter Capacitors get a little bit TIRED of being constantly subjected to high temperatures near heatsinks that are used to keep semiconductors within operating limits. You can determine how bad this may be if you can do a test and remember what happens. Here is what to do. Make sure PC is fully booted displaying WIN desktop or some other screen. Next, with someone to keep hitting the CTRL or SP bar key every 20-40 seconds while you reconnect both cables of your MM17 back to the PC video port and ac outlet. Now try to turn on the monitor and note exactly what you see and for how long. Did it have a sharp clear image, even for 1-2 seconds? did the screen go black? OK! Next thing is to shine a bright flashlight onto the screen 2 inches away from where you know there was something a few seconds ago. Try it at different angles and not if you see anything. get back to me with results of test. I'm louie12fix on fixya or lmistyrel @ aol.com BYE for now.

Check to make sure the cables are connected tightly. Wiggle the cable, does it get better or worse? Might need a new cable. And reseat the video card inside the computer. If that doesn't fix it, then yes you will probably need a new monitor.

this sounds like there is an internal short in the wiring cables that connect to the monitor.

Try replacing the cables if you can, if not contact Best Buy's geek squad and they can take your monitor overnight in most cases and have it back to you by the next day working perfectly fine and for little to no charge.